Telephone call recording system



Aug. 16, 1949. J. c. POND TELEPHONE CALL RECORDING SYSTEM 3 Sheets-Sheet l Filed March 10, 1947 Augv 1e, 1949., J1, C, POND 2,479,352

TELEPHONE CALL RECORDING SYSTEM Filed March 1o, 1947 v vs sheets-sheet, z

@wmenmc ommen JAMES C. POND y ATTORNEY J. C. POND TELEPHONE CALL RECORDING SYSTEM Augo E65 949 Filed March 10, 1947 l2 Il H2 IH 3 Sheets-Sheet 5 INVENTOR.

JAMES C. POND ATTORN EY Patented Aug. 16, 1949 UNITED] STATES PATENT OFFICE l 2,479,252y f n TELEPHONE CALL RECORDING SYSTEM James C. Pond, Glen Ellyn, Ill., assignor to Automatic' Electric Laboratories, Inc., Chicago, Ill.,

a corporation Vof Delaware Application March 10, 1947, Serial No. 733,562v

Y l This invention relates to telephonesystems of the automatic type and'more particularly to the provision in such systems, of a mechanism for use at subscribers premises for recording the telephone number of lines' which have called and which have not been answered and also apparatus in the central oiiice which. will respond to certain conditions of the connecting equipment to transmit impulses to the premises Where the call has not been answered to operate the mechanism at `the called station to display the calling number. v

A called subscriber in the ordinary system who 9 claims. (01.'179-55) Y e hold the called subscribers line connected to the is absent when a call is initiated t0 his telephone s has no means of knowing that hehas been called or the number of the calling line. Also, a calling subscriber not receiving an answer to his first call will make several subsequent calls in an effort to obtain ajresponse from the desired party. Should each line be equipped with a call recording mechanism it would not be necessary to make the subsequent calls, as each calling subscriber would know that his firstY unanswered call had been recorded at the called subscribers premises j and that the wanted party would, in due course,

return the call.

An object of the invention is to provide means for recording incoming calls at called subscribers" tem suitable for use with an automatic telephone' system employing the well known types of two motion line finders together with selectors and connectors.

The present embodiment contemplates therecording of three digit numbers, although the principles herein disclosed could be employed to include arrangements for recording numbers of more or less than three digits.. Y

A further object of this invention is to provide a novel mechanism for use in'connection with a subscribers telephone instrument and line for displaying on a movable tape oriilm, a visible record of the telephone numbers of any calls which have reached the telephone and have been unanswered during any absent period of the called subscriber.

Another object is to provide an unique impulse producing device for a central telephone connection, which has been established by the calling subscribenffor a sucient length of time after-the calling party has abandoned the call, for the impulse producing device to transmit impulses, representing the calling partys telephone number, to the recording device of this invention, at the station of the called party.

An embodiment of the invention as applied to a well known'step-by-step automatic telephone system of the three digit type using line iinders, selector-s and connectors, will now be described and illustrated by drawings consisting of four figures on three sheets. Y

Figure 1, f a typical connection through an 1 automatic step-by-step three digit system wherein the Well knownsubsc'ribers line finder equipment and selector switchV are represented by boxes and only portions of the well known connector and telephone'circuit'are shown to simplify the explanation of the mannerV of conne'ctingapparatus whichrforms apart of this invention,

Figure 2 is a Vschematic drawing illustrating the essential parts of the recorder of this invention as applied to a called subscrib'ers premises. HFigure 3 shows theconnections of the impulse producing device ofthis invention as used in an automatic exchange. system which is to be equipped to giverecording service.

Figure 4 shows atypical recording of the telephone number eight hundred twenty nine, which was chosen as the number of the calling line in the description of operation. Y Y

For convenience in tracing the circuit, these drawings should be fitted together in the following order: Figure 2 at the right 'hand side of Figure 1r and Figure Sunderneath Figure 1.

A description of theoperation of the circuit,A

follows. A calling subscriber ata telephone,

such as 'indicated by the circle ISI, shown in the upper left of Figure 1, lifts his receiver or handset, vwhich'in the well known manner causes thetelephone bellto bedisconnected from the line, which 'consists of a pair of wires from the telei phone instrument to the line equipment |52V in the central oflice, andv to cause the receiver, transmitter and impulse dial to be connected int'othe line circuit. Thisoperation causes the line equipment Y|52 to'loperate and'set in motion a'two motion line finder'. |53 which responds with an automatic vertical movement followed by an 3 automatic horizontal movement, of its shaft, to connect its line wipers to the terminals of the calling line.

Simultaneous with the vertical and rotary movements of the line nder shaft to connect the wipers with the positive and negative sides of the calling line, a single conductor vertical marking wiper has been moved over a single conductor vertical level of contacts to a ,Contactin a position representing rthe tens digit of the calling line. Also another single conductor marking wiper has been moved over a single conductor horizontal level of contacts toa Contact in fa -DO- sition representing the units digit of the calling line. These markings on the :single ,conductor vertical and rotary levels :are the means which control the recording of the tens and units of the calling line. This will be clear `,from .the explanation of the operation of the circuit which follows.

As the outgoing circuit of this particular line nder is permanently associated with a rst selector, =the calling -li-ne `=is,--"ai5ter l`the completion of `the aforesaid vertical vrand horizontal movements, connected to Vaiirs't selector |54. The dialingtone is .now connected-to the calling line to indicate -to thecallir-ig subscriber that dialing' may commence. The .callingsubscriber dials the hundreds, :tens and iunits :of the desired number, first the hundredsY dig-it, causing the selector to lift its shaft vertically and. 'set 4the wipers on -a level representingthe hundreds digit of the called number, an Vautomatic rotation of the selector shaft takes place causing the wipers to pass over the ,contacts of the-selected level until an idle trunk to a connector found, here the shaft stops, leaving the-wiper, which lrepresents the incoming side or the .selector .circuit lto which the calling subscriber is connected, ljoined :to a trunk circuit leading Ito an idle connector |55, in the desired hundred group. The second digit of the desired number is nowdialed by the calling subscriber causing the connector shaft to lift its wipers to a level representing the tens digit of the desired number, the final digit representing the units digit ,of the desired number is now dialed V,causing the connector shaft to rotate its wipers over the selected level to the contacts corresponding to the last digit of the desired number, thus completing the connection from the calling line to the called. line through the line equipment |56 of lthe called line. In the well known manner the connector |55 automatically sends back to the callingfparty `a suitable signal to indicate to the calling subscriber the condition of the connection, that is, a ring-back tone t0 indicate that the connection isoomplete to 'the dialed line l.and that the called subscribers bell is being rung, or a busy tone to indicate that the dialed line is busy, or one of several other signals to appraise the calling party of the cond itiorr;v Should the called linebe engaged, the calling subscriber` frees his line fromv the busy number by hanging up his receiver or restoring his handset to its ,Cradle and -he may repeatl the call after waiting a reasonable Vlength of time. Should the called line be free-the ring-back tone will indicate that the bell is being rung andif the called party hears. the bell and answers in due course, a regular vnormal call has passed through the exchange and the impulse sender and recorder of this invention have performed no function in such aj call.

Attention should be called to -relay 81 in Figure 1 which Vlerfoliris a yfunction in connection With a Call Such-as described above, that is a CIK 4 normal call through the exchange. Relay 81 is provided with a contact 19 to short circuit one of its windings as soon as the armature responds to the energization of the operating winding, this causes relay 81 to be slow to release. Relay 81 has been provided in this circuit to assure the non-starting of the recording apparatus in connection with a normal .c aIl, regardless of which subscriber, the :calling or 'the called ysubscriber hangs up his receiver first.

On a normal call, during the period of the con- 'versation the following principal relays will be vin .operated position, 81, |58, |59, |62 and |53. v,Should the calling party hang up his receiver rst relays |58 and l|259 ',will restore, the latter (relay 11559)- ,closinglits .contact |13, a part of the release magnet circuit (not shown). Relay |62 however remains operated through the called subscribers line loop. At the moment relay |58 restores, the holding circuit for relay 81 is transferred from the winding of relay Y| 59 to .the number one winding :of relay 8U. ARelay 81 will remain operated over the following circuit; battery, number one winding fof Arelay 8-0, drotary off-normal 'contact -l A1|, break contact |^E5, break "contact |8|, number one winding o-f relay 81, make contact '|16 of relay |62 to ground. However, relay 83 cannot operate when its number one winding is included in the above described circuit in series with the lnumber one winding of relay 81 and therefore the urecording apparatus cannot be started. VSoon after the callingparty vhangs up, the called party will do the same, causing relay |62 4to restore, closing a second part of the releaseinagnet circuit (not shown) 4at contact |15 causing the switch to return the shaft to normal.

Should the called par-ty hang up first, relay |52 will restore rst, `SWi'tchiHgthe holding ground for relays 81 and |59 -fromcontact |16 to |11 through contact 88, and close one part of the release magnet circuit (not showin) at contact |15. Thusrelays 81, |58 and :|59 remain operated but relay will not operate to start the recording apparatus. A short time `after Athe called party hangs up, the calling party will restore his receiver, relay |58 restores,.opening contact |82 disconnecting ground from relay |59, relay |59 restores and at contact |13 completes the circuit tothe connector release magnet (not shown) causing the connector shaft 'to return to normal.

However, in vthe event that there is no answer from the called line and the calling party abandons the call by hanging up `his receiver or replacing ther handset to its cradle, the apparatus of this invention will vfunction to record the ynumber of the calling line on a recorder at the called partys premises. `In `the Vtypical connector circuit |55, the relay |58 furnishes battery and ground back to the calling line Vand this relay therefore is energized during the time the calling partys line is connected. Relay |58 through its contact |82 closes the circuit 'to relay |59which also remains energized during the time the calling partys line is connected. Another contact, `|83 on relay |58 connects lground to relay |63 through other contacts (not shown) which cause operation of relay |63 Eonly after the. lconnector `wipers connect with the called line and controls a circuit to the positive and negative wipers 'and this relay I'53 will also remain `venergized during the time the callingparty is connected Vto the connector circuit 55. The usual relays have functionedyduring the building up. of the call, such as relay |60 whi-ch closes the circuit tothe vertical Amagnet (not, vshown) during the vertical Sgm-,25a

movement of V.the connector lshaft and relay |6| which l functions during the horizontal movement of the shaft. Asl the connectorisnow in. "ringing` position,'. that is, Yringing current (not shown) is being applied, and the called partyV has not answered then switching relay |62 has not operated. Should the callingY party lnow abandon the call, relay |58 will restore to-normal, opening the circuit to relay |59, butlasthis" relay'is slow to release, its armature will remainY operated a short time after the armature of relay |58 restores,`but this feature has no function at'the moment. The vrestoring ofA the arma-Pi ture of relay |58 and the closing of contact armature of relay |58 and the closing of contact |8| completes. the following circuit; battery,

number one winding of relay 80, rotary off-normal kcontact |1|, backcontact|65 offrelay ISI?, backcon'tact 18| of relay |58, back contact 89 of relay 81,*back contact |11 of the unoperated relay 62, toground, causing relay 80 to operate,

opening two contacts and closing four contacts.

The opening of ccntact83 disconnects one Winde' ing-,of relay |58 fromth'epositive side of the connector talking circuit.. The opening of concircuit, assures that the connector will not release its shaft until after relay 80 restores to normaL,` that is after the recording is completed. :Con-1 tact 85 connects lead |80, from a contact on level 3| of the -three level rotary lswitch F, to the C,lead of the connector. This connects alternatingcurrent over lead |80 to the control conductor and also over lead |14 and through con-`v` denser 26` to relay 40.V The closing of contact 86 of relay 86, connects ground through'resistoror tact 8 4, which is a part of the connector release choke coil 18, to the control conducton This reached this particular bank Contact. Contact f 82 closes the following circuit; ground, contact 82, lead |12, winding of relay to battery.` .Thus the operation of relay 35 follows the operation of-relay 80 vand through its contact 36,batteryr'- isavailable to operate the magnet 30 of the three level rotary switch F. Immediately after contact 36 on relay 35 is closed, magnet 36.is en-Y ergized overl the followingl circuit; battery, make contact 36, break contact 34, resistance .25, wind,-A in'g of magnet 30 to ground. The magnet armature moves to step the three wipersofr levels 3|, 32 and 33 ontoV the first contact of their respec-L tive'bank levels, ai; the same time the opera; tion of 'the magnet armature breaks the circuit at contact 34, tothe magnet winding causing the armature to restore, this recloses the cir' cuit to the magnet and the switch will continue a step by step movement until the wiper on bank level 33 finds ground on a bank contact,'such as described previously by the operation of relay 80 and the closing of contact 8|,l which .placed ground on one of thecontacts of level 33. Thus; this three level switch F has acted asa finder to locate the particular relay 80 `which is'asso'Y ciated with a particular connector (in this case connector |55) on which a called line` is beingv held following'itsabandonment by a calling line.`

nvllt"-shouldfbe noted here that the threecon-.

ductors 118 v|19 and |80, vtwo of V'which having. been mentioned above, which extend from spring contacts on"relay 80ste bank contactson three different levels of the rotary switch F, are con-- nected tothe same numbered contact on their At the same time ,relay-351;

respective levels. Q closed itscontact 36 to operatethe magnet 38 oi' the three level rotary switch ,F, two otherY cori-1V tacts 31-and 38, on relay 35, were closed, Acontact 31 to extend battery to the magnet coil v1|) of vthe'four'level Yrotary switch E and contact 38d to extend battery to an individual ybrush 21 on f the commutator D. The four level rotary l switch VYE Voperates over thewffollowin'g circuit;

battery through contact 31, contact15, resistance 15,1 'winding'of magnet'w to ground. It should Y be noted here that relay 48has operated over the following-v circuit; one side of an alternating current'cir'cuit is groundedgand the other side is connectedto the wiperron level 3| of rotary switch F, through the wiper andvbannkeon-p tact, lead |88, contact 85 on relay/:88, the icontrol'conductor through the selector, lead |14,

condenser 26winding of relay 48 to glrQUlnd.v

Therefore ground from contact 4| of ,relay '4il, over lead |10, is availableon the correct contact of level 1| o f rotary switch Ev to actas a shunt tov stop the rotation of the wipers of thisV switch asf-'soon as the wipers reach this particular'fnurnbered contact. It will be understood" that the three otherawipers ofthis rotary switch? E are now resting on the same numbered contacts in their respective levels 12, Y13 and 14, as

the bank vContactin level 1| to which ground' is furnished from contact 4| of relay 48, as above described.` Inv thisi'manner the line finder onV which vthe calloriginated and onwhich the call--`V` ing line hasbeen marked,y is'electrically heldin association with Athe connector which forms a part of the link for this Vparticular call, irrespective of the fact that the calling party 'has hung up his receiver: This link will be maintaineduntil the -commutator D, under the control vof the auxiliary apparatus of vthis invention, has

transmitted through the link and over the called` subscribers'line, three series of impulses to actun. ate'the recorder at the called subscribers stationA to record the number of the calling line.V It will be noted Vthat relay 48pis being held in operated position by alternating current supplied through the wipervof bank level3| as described above. TheV operation of' relay 40 caused the positive side of vthev trunk, between` the line finder |53 andltheselector |54 to be opened at contact^43 separatinglead 59 from lead |66y and through contact 42, the positive sldeeof the trunk from selector `|54 and'connector |55 Ythat is lead |68 is, connectedv to springs on relays 44, 45 andv 46. Relays44, 45 and 46 will be operated vin sequence as later explained. The rstrof these relays to operate is 44 and at its contact 41, the above mentioned lead |66, that is, the positive side of the trunk to the connector will be connected to n brush number 68 on the commutator. It should berepeated here that eight hundred twenty nine VWas chosen for this description, Aas the number The eighth group of line of the calling line. Y Y finders arecthe only finders Which are operated in connection with calls originating in .theelght hundred group of lines and therefore, as our callf ing number is eight hundred 'twenty.nine, one of Y the Vfinders in the eighthgroup.' will pickup the call and the armaturespring for contact 41 on '1elay`44) will bejconnected vto the eighth 'lead'in mutato; (which is :brush number '62): through :@15;

theoperation 0f relay e571 ,end.-nlly,leaclfrlttfi willlloegconnected to the-ni.r1th, crbrushfnember; 69.9 l Y The cemmutator.- DvA comprises a femm-na. druznecarrying threeidenticalsets of metal-:bar each set consistingof ten barsor segments olierent.` lengths, the longest one; also be1 ,-i Wilder than, anygof the; otl'iernine ninegl spaces-ebetWeenthe-bars are equal i113 Wielth n are iilleclwith insulating materiale similar in rangement to the commutat'orf of` adynammho: f everxthefnsulated Space: between two diierentc sets .of'.bars issomewhat wider thawthe spesegA Y tofthe axis of the, shaft and. each, brush Contact with. particular; groupe-Of ,bere-esther olrlumrevolves;vv All hars are 'joined atione endeb a, metal .ring which isfsuppliedfwith, LCurrent fro 1n brush*V l 51, and as the,A ,drum .revolvealbrush, ruim-1 berjl at the, left receives threefsetsof 4one iini pulse each off cur rer1t during .each revolution .of, the drurn, Brush number. 652. receives -Sfsetsr offs,

2 impulses each and. each brfushyreceiyesyimfe pulSeS, in accordance i with .its position; the tenth olie at the-rghhbrush numherEl--receiving three f5 sets ofi ten impulses during-vr each revolution-: cfm theshaft Due to the one ,ratherrwide bar; andy;

brush 4,numlmer 6D will Vbe i slightlylongenthan any; of theremaining nine andthe-space between; two, series of impulses will beslightly longerithanthe 1 snacebetweenany two impulsesota series.: so 5?, conta-et HMO batter In cimiunction with thewider spa*sing,between` 'the-sets .ofj.bars, each of theseispaeesisiproel.- Videcl; with' a short metal segment fsucl'ifasi., 52m-,fv 58,B and =5v8,` in.juxtaposition to two brushes 21s and 28am-angelV in such a mannerthat the two-.55

brushes 1 are4 joined together. electrifcallyfythreef times during each revolutions. of t1'1'e :dri-un,V ,take`1 ing placebefore eachseries of iter1,impulsesion brushl number 60';

As mentioned above, Ithe armature; springwolaco turn 1to normalV and jrelay 45 ,operatesi connect,

twp, impulses and finally relay, As. operatestono IGS- will receive a series ofnine impulses. .It1 tvl'l-, 75-5 ingglead 1 66 through: Contact ,138300. the .wiper-,resta t5 beecleamfnomithe; abotfefithat the snumbenfofz sima. pulses-sent over leadfl thnoughrithe connected: Cimlit. iandcthe v telephone line to a the krecordereaI-i, i the-;calledypartysgpremises; are-f governedzby; the ev groupnllmbel fof? the linewnder iwhichxpicksmpa:

the;U ca11ing flihe,:the. position, of theiwper on: the 5 Veletcalribankcandfthe positionf'of theiwper onzI thehonizontalt bank of the@Y particular nders. whchaoperated to connect itself tothe asaidcall ingfline: andto. vextend that` linef;to.:-an1id1e :selec-al Y extended. tothe numberfonecwindngsofathe-slowfto i'. releaserfltelays; rt' I: and.: 52 '1in sequence; When? Segment: :58H connects brushz'l 'totbrushl' 2&1 battery will be. `exneno'IC-:d torelay 5= and 4throughl break contanti! 2e (onthe Ses- Erelaycombinationl to grounds operatingsfrelay. .551i Here itil shouldgbecnoted that: thea-armatures of* relaysf'UF-l andftzare: mechanically in 1c'ombinatio'n-tofy func'- w tions-as follows: theauenergization of the-number@ Y one; zwindi'ngi.: offy relay-50 Ymoves? it'si armature to 1,.- armature lrestoresf but riot-fall of the contacts `re'-A turnftonorrnalatlths time;-` Contact I 2t) remain# ing open. aiiclfcontactfl 2-|`r`emainirlg closedydueto ther-above mentionedllmechanicalfeature; until at" a laterfstagethe Windingof relay- 3-i`senergized;" Relax/'5151 andf'', `aswell'as relaysZand 55 alsof'v operate as :mechanicalcombinations,same 'as the" mechanical combinations'of Arelays fandS; "ex' planed'above. Asicontact-I IZ'makes before I2IT' breaks; alholdingicircuit is completed to maintain the-Larmat-u-re of relay 59 in operatedpositionby.. energizing-nsf numbei'two winding through the following circuit;"grounhumber two W-rdingof l relay- 5th-"brushA numberl; ten segments. of.Y the! commutatorgcommon' har 56`ofLth`e1dru-n1, brush-M n Tlclscries. often im g pulses-from ,brush 6 @through theiabove described t circuit V`'being suhcient to Vh'oldin operatedlposif tionyftl'e'iarnature of slowmto relaserelay 501; Al'so-battery ,fro'm brush 6e! Fthrough contact:` I I3.-. -v

fourlevel' ro'taryfswith Ef lead IE7,- wnding -of slowl'to" release' relayito .groundoperates Vrelay-' 44: losingits Contact 41,' fthrough, which f ina- 1 pulsesirjrthis. case eightimpulses,fbecauserwe-fhad previusly'selected number eight hundred'twenty nine"a's' the"r` calling linWnumberi-,and -as explained; e abovefthe can has been' aealtiwith'byi-the:eighthai group ofy ilinefdersr. willmbeiransmitted- -from 1".-

link fcircuitjwhchis beingghellandf-,oVerf-the' subfscribers'lireLtoregsterfthe-hundreds `digit of the'v callinglne .fon .therecordereat -I-:thefcalled 'partysf'vv sttionn. Immediately: a-fter- :the abovedescribe'dff actions, brush number.v ,is i deprived-of current; y due ,to sthe ,insulated spaoe=onrthe `rolrum" betWeenfI-J thetenth. bar ofoneeseries'of [hars :and :Ltheszr's I bar of, Vthe second; seriestbeingnwd-erfthansthin' sulatedf spacesbetween an-yytwo barsforasegmen-ts of img/series .efor afsuicient: :lengt-,h1 offst'me vt0 yallow. the slow to release relay 5!) to restore its armature causing relay 5| to be operated through '116 and 123, open contact 122 andv operate the break-beforemake combination 114 and 115.

aia-,22e

Contact-115 makes before 122 breaks, thus bat- Y tery is furnished to brush` 51 and thev common bar 56, through ten segments on the drum, brush 611, 4winding number two of relay 51 to ground; this is termed the holding circuit to hold relay 51' during the next, or second, setV of impulses.`

Also, battery from the above described circuit can be traced from contact 1 16, wiper and contact onbank level '13 of rotary switch E, lead 169, windingof slow to release relay 45 to ground, operating relay 45. The operation of relay45 causes its contact 48 to connect lead |66 to the wiper on thevertical level, which in this case, as indicated by the dotted lines is resting on Contact number two, representing the second digit in the calling subscribers number. From this contact two impulses will be transmitted over lead E66' and through that portion of .the link which is being held, over the called ksubscribers line to the recorderat the called station to record the second digit of the calling line number. When the second, ratherwide insulated space on the commutator comes under brush 61), the current of the holding circuit to relay 51 will be interrupted a suiicient length of time for relay 5I to restore. The armature restores closing contact 114 to operate relay 52 over the following'circuit; bat-` tery, break Contact 114, make contact 123, break contact 124,7 n`urnber one vwinding of relay 52 to ground. Relay 52 operates, closing contacts H9 and 125, opening contact 124 and operating the break-before-make combination 118 and 111. Atthis time brush number 59 will again receive a series of ten impulses of battery which will'pass through thenumbertwo winding of relay 52 tov ground, to hold this relay. Thisl battery current will also operate slow to release relay 46 through the following circuit; battery frombrush 60, con# tact v1 19, wiper and bankcontact onlevel 1'12 of the four level rotary switch E, lead |69, winding of relay 46 to ground,`operating relay 46.` The operation of relay ,46 will close contact 49 which will switch the lead 166 vto the wiper of the hori- Zontal level, As the wiper in this instance is resting on the ninth contact of the bank, that is, Contact 19 as indicated bythe dotted lines, nine impulses will be transmitted over lead |66 and through the other portions of the circuit, rto record at Vthe called subscribers station ythe third seriesof*v impulses representing the third and last digit ofthe calling subscribers number. f

il'ollowing `the above sequence of operations',

brush number 611V will again be insulatedfrom' the battery on the drum segments for a suicient length of time to allow relay52 to restore, open--A ing the circuit to relay 46 `at contact 119 and closing contact 1 1'1. A It will be .remembered that, by mechanical means, tw.o contacts on each ot the three relay combinations 50-53, 51e-54 and {2L-55,V are being `held 'in operated position,

therefore'contactsj 126, 122 and '124 are open and contacts |21, 123, and 125 are closed. At. the' moment when relay 52 restored, battery through 1 as the coils :arel energized yin sequence beginning VAthespring,sets whichfhave been held off-normal, Y

opening contacts 12|, 123 and 125 and reclosing contacts 120, 1 22 Iand 124. This same battery current from contact Y111 (onjfrelay 52). through vContact 125 is connected to the` slow to release relay 39, which immediatelyoperates closing its contact 29 to'connect ground, through the wiper landba'nd'A contact 'on level 32 offthe three level rotaryswitchfF, lead 119,130v the .number two windingof'relay ,80 `and as this 'current acts in opposition to the current which has beenholding this relay 80 in. operated.,position,y through its number onev windi`ng`,3the. magnetism will be neutralized'and thr maturewillrestore, allowing all apparatus a o Yestorejto norniaLll 'has been shown ',In the above. descriptionit how-three 'series lof/impulses representing the calling subs'cribersnumber' has been transmit-y .to a recorder'at the called subscriber's premises.

It .Willnowbe-explained.how these impulses operatejthe recorder't'o'produc e a .visual record of 'the calling number. QOnly ap'ortionrfof lthe telephone circuitfis reproduced to'show the method 0f Connecting. the` .Circuit ofl'he-reofde t0Y the telephone line.j V'Ihefleaj'd 164 'from'j therecorder is connected to Va. springof. relay 92 andthrough contactSS to' a spring` inthe" hook switch as semblyand throughcontact 91, is connected to the positive side Vof thline circuit. Whenalternating current' isfcorningjin t0 .the called lsubscribers instrument yto Aattuate the bell, it alsopperates relay l92'through the condenser 98. This causescontact 9,15, of relay'92 to remain open,l for the ydujr'ationofltheringing period, toicompletelyiisolate thecirlcuit 0f the" recording av paratus,' "Also duriijigv `'the' timeithisftelephone is being Vusedjon anoutgoing call or when answer# ing an incomingV call,v the vcircuitof the recorder is ji'solatedby the 'opening of contact V91,which is in the' hook switchfspringassembly, which is actuated by lifting the receiver. or handset from` pulses'of current representing'digits in a calling number.j Each group. of coilsisprovidedwith a cylinder. which` movesup [and around the coils with coilnumberondand returns to normal by spring action when thewimpulsng circuit is re# opened. A stylus, 'suchfas"141'142 and 143, is attached vto.ea ch` c`ylinder and moves up'andY down,'for forward and'back, overa paper ytape and carbonforv a iiliriv or other materiallcapable. of receiving an impression, each impression indi-y eating one of the digits` in'the calling number.

After' thelastdig'it has been indicated on the` tape,`the tape is Amoved by the actioniof a' motor,

contact 1'1'1 passedgthroughcontact'125 (on the 52-55 relayv combination) tothe windings "of three relays 55, 54 and53,'e'nergizing the relays and causing their Varn'la'tures lto lmove, to release to displaythe recorded number and to again place 1 under the stylusesan unusedportion oi thetape in Y preparation for .a Vsubsequent recording.

j The lead 164 is connected in the telephoneA instrument to the positive'side oi the telephone circuit: va'n'd'taken to the recorder where it is connected to the windings oi relays 91, 93,114,195 and to thefwindin'g of magnet 90 and the wiper |66 'of' the'Y singlejlevelfrotary switch; Also, it shglildbefjneted; 'ataslthew'iper l'is resting onnthferstpbank nta'ct 101', andthis'contact is'multiplied to the coils numbered oneof eachv oftheithree coilgops 138,"139a121dv 146 battery e -12 tact Y|2` isropenanvd ljremains closed dueto the mechanical latch. Ground through break ccntact |25, make contact L29' and break Vzioriigzhtjft, 32 is 'loiv coniected tooe terminal of the Winde ing of relay. 94%,' While the other terminalis directly connected to 'the incoming lead |64,` therefore, relay VVvvll operate from the first (the rather longlirnpulse f the second series, also the numn ber' onecoil of groui IBB-'Will be energiaed from Ethis same impulse, the cylinder |42 Will moveto a position Where its pointer is opposite the iigulfe "1, idrtliei this samev impulse will `energize relay 9|v and magnet 99. As previouslyexflained the iirstfenerg'izatin of vthe'. magnetlil, any 'y Yont: Sries, moves the ratchet contro-lling the Wiper assembly,'but doesnotmove the .Wiper ISiLas the mechanical arrangements between the armature ci magnet 9G andratchet and pavvl of relay 9|, are such that the Wiper is moved forward during V the restoringcycle ofthe magnet armature. The second and last impulse of thesecondseries causes the Wiper. mi! 4to bemoved tothefsecond contact Q f the bank vand thefc'ylinder M2 `'With its stylus to, be moved into'second position Where the Vpointe;` it indicates numbetwo as 'the second digit of the number being' recorded. Y

During" the interval between the second and thirdseries of impulses, thevviper IM returns to thenumber koneccntacto'n the bank, the cylinder |42 'returns to a position slightlv .o'ii-normaLA contacts" l'ily and "igrem'airi oen, Vvvhile contacts |39 and |33 remain closed; the'latter Contactv L3; being held closedV due to the mechanical latch. (ground through break contact ISS, 'make contact andhbrealcontact`|36is now connected to one terminal' oi the Winding of `relay 95, While the other terminal is dire'tbf Vconnected to lead 54, therefcrerelay 9:5 vvillV operate from the first (the rather lang) impulse of thethird series, also as previously "explained in Yconiflection with the rst and seo'ld'series ofimpulses, this rst impulse ofw thtliid sferie's` vvill energize relay 9i and mag- 199( t net', also the number one coil of the'third group ann-ii in il it@ aad the-Subsequent impulses will raise .the

Q 1m 4.Ul 5 @guider |43 and stylus to a position Where its po yt'er'indicates theure nine as the third digit ofi'. .the number being recorded. Thus, each of thellilire4 cylinders'vvitli 'theirfstylus have been moved upward 'nya series- 'of impulses and ref, tiiiedby spring' action and arec'ordirig has 'been a second recording and ally'rturn all apparatti@ norwallfefieril las@ ilimlS/Ve ef da third series ,'battery curr-eritisno longer available i Iggltigllt over lead |514 to maintain relay 95 inv operated t L hlall, gositionfandalthough relay 95 has slovv to release i, i characteristicfsjit will release its armature shortly after the last impulse, contact |35Wil1 open,l con-` With the ,Y A, v

afge rqiq'er which niques, @hanane after Saleh recording. The. commercial Carien? mayb? progressively. l energize stylus [21| nivedlt J marks the highest numlpegh alli d cas '8)- Y Y Y e tdihrquah'contabt |317, t0 @he terminal@ During the! interval betv antilla/matarla '10 da @www r en@ throught contact; Y1.311.419- .the tHe 'f'w f @maremma @f the meer. The meer u@ will 'cariiaiie to totali@ its! arriewre until the., current suppiyl s disconnected by @peni-ng contact |31.

erimma'si @f fhei meer 14a; of the para el` th. @dee @i fa parav4 illustration in Figure 4. This tapeis stored on a cylinder |41 and as it is released by the rotation of the cylinder |41, passes over a free roller |46 and between the three styluses of the three cylinders |4|, |42 and |43 and a xed `surface |50. The cylinder |41, which is rotated 'by' the motor, carries three equally spaced projections or bosses 2|, 22 and 23, one of which, after each recording acts to stop the rotation of the cylinder |41 and, by the magnetic armature 24, the mechanical latch 99 is tripped to release the off-normal condition of the spring sets associated with cylinders |4|, |42 and |43. The contact |31 associated with cylinder |43 will open the circuit to the motor, the motor will stop. The tape has been moved a suiiicient vdistance to display the recorded number and at the same time, a second portion of the tape has been brought into vposition for a -subsequent recording. I

In Figure 1, a relay and condenser 98 are shown wired into the circuit of the called partys telephone instrument, these serve to completely isolate the recording apparatus and circuits from the telephone line during certain periods. For instance, when alternating ringing current is incoming over the subscribers line to announce an incoming call, a part of -this alternating current will pass through the condenser 98 and the Winding of relay 92, to ground, operating relay 92, causing its armature to open contact 95 to isolate the recorder, but which Will be re-connected to the line when ringing current ceases and the armature of relay 92 is restored. Again, when this telephone is in use for an outgoing call, the lifting of the receiver, or handset opens contact 91, which also acts to isolate the recorder. This contact 91 is a part of the hook switch assembly and therefore acts to disconnect the recorder when the subscriber answers an incoming call.

Having described my invention, what I claim as new and desire to secure by United States Letters Patent is:

What is claimed is: e f 1 1. In an automatic telephone system, a plurality of calling and called subscribers lines, a plurality of connecting links in said system for connecting said lines, a recording device associated with each said called lines, an impulse sending apparatus consisting of a rotatable drum carrying three sets of bars or segments each set consisting of ten metal strips of varying lengths uniformly arranged around the periphery of said drum and all electrically connected by a common metal ring, a brush resting on said ring to furnish electrical current to all said segments, means for rotating said drum, ten stationary brushes resting against the surface of said drum in such a manner that the first brush receives three impulses per revolution of the said drum, the second brush receives six'impulses per revolution of the said drum, and similarly all brushes receive impulses according to their respective positions from the rst to the tenth which receives thirty impulses per revolution, three individual metal segments equally spaced around said drum, two brushes so arranged as to be short circuited three times during each revolution of said drum by said three segments, means controlled by a calling subscriber for extending a connection to a called line including one of said links and associating said sender with the connection, means eiective when said established connection has been abandoned by said calling subscriber before the said called subscriber has answered to cause said impulse transmitting apparatus to transmit impulses over one conductor 14 of the said established connection and over one conductor of said called subscrbers line to actuate said recorder thereon to record and display an impression indicating the calling subscribers number.

2. In an automatic telephone system, a plurality of subscribers lines, automatic switching means controlled from a calling one of said lines to select a called one thereof, a recording apparatus individually connected with said call-ed line including a recording medium land a stylus for each order of digitsY of 'a subscribers number, an impulse sender controlled byv saidswitching means in response Vto the subscriber on said callingline abandoning a call before theselected called subscriber has answered to transmit a plurality of series of impulses to the recording apparatus of the called line, and means in said apparatus responsive to the first series to move one said stylus forward and back across said medium to make an impression thereon with its far end. in a position to indicate the hundreds digitfof the calling subscribers number, and responsive to subsequent series of impulses to move a second and third stylus forward and'back across said medium to make similar impressions indicating the tens and units digits of the number of the calling subscriber. g

,Y 3. In an automatic telephone system, calling and called subscriber lines, a plurality of connecting links, means including said links forextending connections from calling ones of said lines tocalled ones thereof, a recorder for each called line having a series of movable elementsV each carrying a stylus which is movable over a recording medium, an impulse sender, means for automatically connecting said sender with a link included in a connection extended to a called line and for automatically causing said Y sender to transmit a plurality of series of impulses over one conductor of said link and over a conductor of the'callcd line in response to'the calling subscriber abandoning the callbefore the calledl subscriber answers, said elements of the called line recorder moved in sequence in response to said series of impulses to move the stylus of each element to make marks on said medium of lengths representing Y digits of a calling subscribers number.

4. In an automatic telephone system equipped with an impulse transmitting device, a plurality of calling and called subscribers lines each provided With a telephone number recorder, a plurality of links for connecting said lines, means controlled for a calling line for extending a connection including one of said links to one of said called lines, means operable in case said called line does not answer and in response to the calling line abandoning the call to cause said impulse transmitting device to transmit impulses through said link to said recorder of said called subscribers line to record the number of said calling line.

5. In an automatic telephone system, a plurality of calling lines, a plurality of called lines, a plurality of means for connectingy said lines, means on each said calling line for controlling said connecting means to extend a connection to a called line, means at said called line for recording and displaying a number, means automatically operated in response to the calling subscriber means of said called line a signal for actuating 15 said recording means torecord: and display the number of? tliefM said? callingline.

6. Ina telephone system', an impulsetransmitting device, a recorder, said recorder responsive to a series of impulses from said impulse transmittingf device, a magnetic cylinder in said recorder, sets of? coils for said cylinder arranged to befprogressivelyenergized to cause said magnetic cylinder to move, amarker attached and movable with said cylinder,Y a tape of paper or other materialicapable-of receiving an impression when said marker moves over the surface of said tape; means forl connecting said impulse transmitting device-to saidrecorder and operating saidv device forv transmittingimpulses in series of one to-tenA intorsad recorder toV progressively energize said seriesof` coils to cause said cylinder to move said markerover' the surfaceof said tape to lea-ve an impression to indicate-orrecord any numeral fromV one to ten.

'7. In a telephone system, calling and called lines', means for extending connections from calling to called lines', a sender common to said lines havingA a plurality of-- brushes each capable of sending impulsesy for a particular digit, means operatedE during the extension of a connection for selecting-the brushes corresponding to the digits of the line calling, a recorder on each called line including a pluralityof'v recording units, means automatically operatedv in response to the sub-V that each is oper-ated by one of said series of impulses torecord'- thereon theV number of the party calling- 8. In a telephone system, subscribers lines, means for extending a connection from a calling to a calledv one of-Y said lines, an impulse sender commento saidlines; meansoperated during the' extension of aconnection'r forv preparing a marking for said sender corresponding to the number of theL calling subscribefsAL line, means controlled from the"v callingparty* over said connection under certain conditionsv forA4 associating said common sender with the connection and transferringthe prepared-marking'theretoand means determined cy said markings for operating said common senderv to transmit" impulses over said connection corresponding to tle calling partys number.

9'. In a vtel'epli'one-sysi'lein, link'v circuits, means forestabl'isliing aV connectionincluding one of said linl` circuits between acalling and a called subscribers'- line, a sender common to said links, a

series of relays for eachV link, one of' said relaysl foreach order of digitsina calling number, means operated during the establishment of a connection for marking each relay with a different order of digitsin accordance with one-of the digits in the callingsubscribensnumber, means operated by' a calling subscriber after' a called subscriber failstoans-Werl a; callI for associating said sender with theconnectionl andi for connecting the relays of' the connectedlinli'wit-h thesender to transfer the digit markings thereofAv to the sender, saidA sender operated' thereafter to transmit impulses over the connection in accordance-With the digit markings off theconnectedT relays.

JAMES C., POND.

REFERENCES CITED The; following references are of record the 

